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wget: don't be careless with xstrdup'ing

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This commit is contained in:
Denis Vlasenko 2006-10-07 14:28:55 +00:00
parent a655152b00
commit 96e9d3c968
1 changed files with 24 additions and 18 deletions
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42
networking/wget.c
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@ -30,6 +30,8 @@
#endif #endif
struct host_info { struct host_info {
// May be used if we ever will want to free() all xstrdup()s...
/* char *allocated; */
char *host; char *host;
int port; int port;
char *path; char *path;
@ -136,14 +138,16 @@ int wget_main(int argc, char **argv)
struct sockaddr_in s_in; struct sockaddr_in s_in;
llist_t *headers_llist = NULL; llist_t *headers_llist = NULL;
/* server.allocated = target.allocated = NULL; */
FILE *sfp = NULL; /* socket to web/ftp server */ FILE *sfp = NULL; /* socket to web/ftp server */
FILE *dfp = NULL; /* socket to ftp server (data) */ FILE *dfp = NULL; /* socket to ftp server (data) */
char *fname_out = NULL; /* where to direct output (-O) */ char *fname_out = NULL; /* where to direct output (-O) */
int got_clen = 0; /* got content-length: from server */ int got_clen = 0; /* got content-length: from server */
int output_fd = -1; int output_fd = -1;
int use_proxy = 1; /* Use proxies if env vars are set */ int use_proxy = 1; /* Use proxies if env vars are set */
char *proxy_flag = "on"; /* Use proxies if env vars are set */ const char *proxy_flag = "on"; /* Use proxies if env vars are set */
char *user_agent = "Wget"; /* Content of the "User-Agent" header field */ const char *user_agent = "Wget";/* Content of the "User-Agent" header field */
/* /*
* Crack command line. * Crack command line.
@ -185,7 +189,7 @@ int wget_main(int argc, char **argv)
if (use_proxy) { if (use_proxy) {
proxy = getenv(target.is_ftp ? "ftp_proxy" : "http_proxy"); proxy = getenv(target.is_ftp ? "ftp_proxy" : "http_proxy");
if (proxy && *proxy) { if (proxy && *proxy) {
parse_url(xstrdup(proxy), &server); parse_url(proxy, &server);
} else { } else {
use_proxy = 0; use_proxy = 0;
} }
@ -306,14 +310,14 @@ read_response:
if (fgets(buf, sizeof(buf), sfp) == NULL) if (fgets(buf, sizeof(buf), sfp) == NULL)
bb_error_msg_and_die("no response from server"); bb_error_msg_and_die("no response from server");
for (s = buf ; *s != '\0' && !isspace(*s) ; ++s) s = buf;
; while (*s != '\0' && !isspace(*s)) ++s;
for ( ; isspace(*s) ; ++s) while (isspace(*s)) ++s;
;
switch (status = atoi(s)) { switch (status = atoi(s)) {
case 0: case 0:
case 100: case 100:
while (gethdr(buf, sizeof(buf), sfp, &n) != NULL); while (gethdr(buf, sizeof(buf), sfp, &n) != NULL)
/* eat all remaining headers */;
goto read_response; goto read_response;
case 200: case 200:
break; break;
@ -328,7 +332,7 @@ read_response:
/*FALLTHRU*/ /*FALLTHRU*/
default: default:
chomp(buf); chomp(buf);
bb_error_msg_and_die("server returned error %d: %s", atoi(s), buf); bb_error_msg_and_die("server returned error %s: %s", s, buf);
} }
/* /*
@ -351,10 +355,10 @@ read_response:
} }
if (strcasecmp(buf, "location") == 0) { if (strcasecmp(buf, "location") == 0) {
if (s[0] == '/') if (s[0] == '/')
// FIXME: this is dirty /* free(target.allocated); */
target.path = xstrdup(s+1); target.path = /* target.allocated = */ xstrdup(s+1);
else { else {
parse_url(xstrdup(s), &target); parse_url(s, &target);
if (use_proxy == 0) { if (use_proxy == 0) {
server.host = target.host; server.host = target.host;
server.port = target.port; server.port = target.port;
@ -368,9 +372,9 @@ read_response:
} while(status >= 300); } while(status >= 300);
dfp = sfp; dfp = sfp;
}
else } else {
{
/* /*
* FTP session * FTP session
*/ */
@ -499,9 +503,11 @@ read_response:
} }
static void parse_url(char *url, struct host_info *h) static void parse_url(char *src_url, struct host_info *h)
{ {
char *p, *cp, *sp, *up, *pp; char *url, *p, *cp, *sp, *up, *pp;
/* h->allocated = */ url = xstrdup(src_url);
if (strncmp(url, "http://", 7) == 0) { if (strncmp(url, "http://", 7) == 0) {
h->port = bb_lookup_port("http", "tcp", 80); h->port = bb_lookup_port("http", "tcp", 80);
@ -517,7 +523,7 @@ static void parse_url(char *url, struct host_info *h)
// FYI: // FYI:
// "Real" wget 'http://busybox.net?var=a/b' sends this request: // "Real" wget 'http://busybox.net?var=a/b' sends this request:
// 'GET /?var=a/b HTTP 1.0' // 'GET /?var=a/b HTTP 1.0'
// and saves 'index.html?var=a%2Fb' // and saves 'index.html?var=a%2Fb' (we save 'b')
// wget 'http://busybox.net?login=john@doe': // wget 'http://busybox.net?login=john@doe':
// request: 'GET /?login=john@doe HTTP/1.0' // request: 'GET /?login=john@doe HTTP/1.0'
// saves: 'index.html?login=john@doe' (we save ?login=john@doe) // saves: 'index.html?login=john@doe' (we save ?login=john@doe)